<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
    <script>
        class Person{
            constructor(name, age){
                this.name = name;
                this.age = age;
            }

            show() {
                alert(this.name);
                alert(this.age);
            }
        }

        class Worker extends Person{
            constructor(name, age, job){
                super(name, age);
                this.job = job;
            }

            showJob() {
                alert(this.job);
            }
        }

        let w = new Worker('blue', 18, '打杂的');
        w.show();
        w.showJob();
    </script>
</body>
</html>